Environmentally friendly power generator based on moving liquid dielectric and double layer effect.
Environmentally friendly power generator based on moving liquid dielectric and double layer effect.
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DOI：
10.1038/srep26708
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发表时间：
2016-06-03
影响因子：
4.6
通讯作者：
Skafidas E
中科院分区：
文献类型：
--
作者：
Huynh DH;Nguyen TC;Nguyen PD;Abeyrathne CD;Hossain MS;Evans R;Skafidas E
静电发电机利用变电容原理将机械能转化为电能。这种电容的变化通常通过改变两个平行金属板之间的间隙或重叠来实现。本文提出了一种新型静电微型发电机，其电容变化是通过NaCl水溶液的运动来实现的。由于水的介电常数高于空气，以及在电极界面处离子分离形成的亥姆霍兹双层电容器，电容发生了显著变化。与传统静电器件相比，该器件具有低偏置电压和低机械工作频率的显著优点。这是至关重要的，如果提出的设备有效用，从环境中收集电力。在1.2 V的偏置电压和6 Hz的液滴频率下，样机的性能值超过10000(108μW)/(mm2HzV2)，比以前的器件高出两个数量级。提出了大规模电力收集的概念。
An electrostatic power generator converts mechanical energy to electrical energy by utilising the principle of variable capacitance. This change in capacitance is usually achieved by varying the gap or overlap between two parallel metallic plates. This paper proposes a novel electrostatic micro power generator where the change in capacitance is achieved by the movement of an aqueous solution of NaCl. A significant change in capacitance is achieved due to the higher than air dielectric constant of water and the Helmholtz double layer capacitor formed by ion separation at the electrode interfaces. The proposed device has significant advantages over traditional electrostatic devices which include low bias voltage and low mechanical frequency of operation. This is critical if the proposed device is to have utility in harvesting power from the environment. A figure of merit exceeding 10000(108μW)/(mm2HzV2) which is two orders of magnitude greater than previous devices, is demonstrated for a prototype operating at a bias voltage of 1.2 V and a droplet frequency of 6 Hz. Concepts are presented for large scale power harvesting.